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【单选题】
电子打火机的点火原理是压电效应,压电片在受压在两侧形成电压且电压大小与压力近似成正比,现有一利用压电效应制造的电梯加速度传感器,如图 2 所示.压电片安装在电梯地板下,电压表与压电片构成闭合回路用来测量压电片两侧形成的电压,若发现电压表示数增大,下列说法正确的是 ( )
A.
．电梯一定加速上升
B.
．电梯一定减速下降
C.
．电梯加速度一定向上
D.
．电梯加速度一定向下
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举一反三
【判断题】处理器调度程序在该程序执行过程中要控制其 运行状态
A.
正确
B.
错误
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【单选题】Analyze the following statement, and then choose one of the options that you think is best to use in academic writing:The determination of the presence of tumors has seen the standard screening proced...
A.
To better determine if tumors are present, high-energy techniques are now being incorporated into standard screening procedures.
B.
The determining of the presence of tumors has seen the standard screening procedures incorporation of high-energy techniques.
C.
The determination of tumors has seen the standard screening procedures incorporation of high-energy techniques.
D.
The determination of the presence of tumors has seen the incorporation of high-energy techniques in standard screening procedures.
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【单选题】在降低定子电压调试过程中,三相异步交流电动机不会( )
A.
减小最大转矩
B.
减小同步转速
C.
减小启动转矩
D.
减小负载能力
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【单选题】下列先天性心脏病中出现明显紫绀的是:
A.
心房间隔缺损;
B.
心室间隔缺损;
C.
法乐(Fallot)四联症;
D.
主A狭窄;
E.
肺A狭窄。
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【单选题】The purpose of writing this text is probably to
A.
praise the high technological level of Harvard Medical School.
B.
comfort those patients who have developed coronary heart disease.
C.
introduce a new therapy to cure heart disease.
D.
criticize the traditional bypass surgery.
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【单选题】设A是4×5矩阵,B是5×4矩阵,且AB=E,则r(A)=( )
A.
5 ,
B.
1 ,
C.
4 ,
D.
20
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【单选题】下列先天性心脏病中出现明显紫绀的是( )
A.
心房间隔缺损
B.
心室间隔缺损
C.
法乐(Fallot)四联症
D.
主动脉狭窄
E.
肺动脉狭窄
查看完整题目与答案
【判断题】The writing of high-level government documents is usually expected to be informal.
A.
正确
B.
错误
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【单选题】设A和B分别为4×3的和3×5的矩阵,且AB=O(零矩阵),其中B为非零矩阵,下列结论中一定正确的是
A.
B的列向量均为齐次线性方程组Ax=0的解。
B.
B的行向量均为齐次线性方程组Ax=0的解。
C.
A的秩r(A)=3
D.
A的秩r(A)=1
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【单选题】It is in fact correct to say that academic essay writing is of utmost importance in the attainment of a university degree. A high proportion of marks are allocated to the compilation of essay assignme...
A.
Formal, straightforward, clearly written, correct academic style
B.
Informal, like spoken (colloquial) language, incorrect academic style
C.
Too formal, uses too many words, incorrect academic style
查看完整题目与答案
相关题目：
【判断题】处理器调度程序在该程序执行过程中要控制其 运行状态
A.
正确
B.
错误
查看完整题目与答案
【单选题】Analyze the following statement, and then choose one of the options that you think is best to use in academic writing:The determination of the presence of tumors has seen the standard screening proced...
A.
To better determine if tumors are present, high-energy techniques are now being incorporated into standard screening procedures.
B.
The determining of the presence of tumors has seen the standard screening procedures incorporation of high-energy techniques.
C.
The determination of tumors has seen the standard screening procedures incorporation of high-energy techniques.
D.
The determination of the presence of tumors has seen the incorporation of high-energy techniques in standard screening procedures.
查看完整题目与答案
【单选题】在降低定子电压调试过程中,三相异步交流电动机不会( )
A.
减小最大转矩
B.
减小同步转速
C.
减小启动转矩
D.
减小负载能力
查看完整题目与答案
【单选题】下列先天性心脏病中出现明显紫绀的是:
A.
心房间隔缺损;
B.
心室间隔缺损;
C.
法乐(Fallot)四联症;
D.
主A狭窄;
E.
肺A狭窄。
查看完整题目与答案
【单选题】The purpose of writing this text is probably to
A.
praise the high technological level of Harvard Medical School.
B.
comfort those patients who have developed coronary heart disease.
C.
introduce a new therapy to cure heart disease.
D.
criticize the traditional bypass surgery.
查看完整题目与答案
【单选题】设A是4×5矩阵,B是5×4矩阵,且AB=E,则r(A)=( )
A.
5 ,
B.
1 ,
C.
4 ,
D.
20
查看完整题目与答案
【单选题】下列先天性心脏病中出现明显紫绀的是( )
A.
心房间隔缺损
B.
心室间隔缺损
C.
法乐(Fallot)四联症
D.
主动脉狭窄
E.
肺动脉狭窄
查看完整题目与答案
【判断题】The writing of high-level government documents is usually expected to be informal.
A.
正确
B.
错误
查看完整题目与答案
【单选题】设A和B分别为4×3的和3×5的矩阵,且AB=O(零矩阵),其中B为非零矩阵,下列结论中一定正确的是
A.
B的列向量均为齐次线性方程组Ax=0的解。
B.
B的行向量均为齐次线性方程组Ax=0的解。
C.
A的秩r(A)=3
D.
A的秩r(A)=1
查看完整题目与答案
【单选题】It is in fact correct to say that academic essay writing is of utmost importance in the attainment of a university degree. A high proportion of marks are allocated to the compilation of essay assignme...
A.
Formal, straightforward, clearly written, correct academic style
B.
Informal, like spoken (colloquial) language, incorrect academic style
C.
Too formal, uses too many words, incorrect academic style
查看完整题目与答案